Steam-generator of the locomotive type.



3 Sheets-Shed I.

` ,jv/@ffy Powfrz/Z.

A jy.

oooooooooooooo oooooooooooooo oooooeooooofo Patentd'SeptylS, |9025.

STEAM GENERATOR 0F THE LC-MOTIVE TYPE.

No Model) Patented sept. rs, |902.

I H. PLowmAN. 1 STEAM GENERATOR OFTHELUCMOTIVE TYPE.

V(Application iled Apr. 34, 1902.)

3 Sheets-Sheet 2.

(No Model.)

,oooOoooo 4oaoonvooc ooo umooo ooo0.\onoc 0606.0 ooooadoo QooOQOo -oocoooor ms mams PETERS co, pnorauruo.. wAsmNoToN. n. c.

No. 709,412l. l Fammi sept-16,1902.

E H. PLowMAN. j v STEAM GENERATOR 0F THE LocommlvE TYPE.

(Application med Apr. 24, i902.)

3 4Sheets-Sheei 3.

(No Model.)-

v UNITED *STATES PATENT OFFICE.

HARRYPLOWMAN, oEL'oNDoN, ENGLAND.

STEAM-GENERATOR oF 'THEtLocolvloTlvE TYPE.

l SPECIFICATION forming part of Letters Patent N o. 709,421, dated September 16, 19'02.

Application iled April 24, 19102.? Serial No. 104,515. (N IOdBL) l f T0 all whom uit may concern.;

Be it known that LHARRY PLOWMAN, a su bject of the King of Great Britainandlreland,

i residing at 122 `Kempe road, Kensal-Rise,`

l c London, W., England, haveinvented certain new and useful Improvements in Steam-Genl erators of the Locomotive and other Types, (for which I have made' application for Letters Patent in Great Britain, No.14,275, dated the 12th of July,.1901,) of which the followi f lo ingisaspecicatiom f steamjgenerators of the locomotive type, but i. is` also applicable to other types of tubular Y increase the heating-surface and water circli- `jlationin such boilers, so as to enable a higher to be attained J eiiiciency of steam generation p a than in the present type.

\ 2o My invention consists in arranging within theboiler shell or flue a nest of Water-tubes which are joined "at theirendsby headersor `connectingboXes, theone box communicat-,

Figure 1 is a longitudinal section ofa locomof; of Fig.` 1. fa plan, respectively`,.of the ringinclosing x header and iirelhole,while Figs.` 6 and 7 are ank 1 elevation and a plan ofthe header at the lirebox end. Figs. 8 andr) showthe methodv of 1 applying myinvention tothe ordinary marine `type of Scotch boiler, Fig. 8 being a longitusection;` -A 3 i a i i The arrowsnthe iigures show the direction `Q 'ofthecirculatiom I 1 Injcarryingfiny invention into elect `according to onemodification as applied to a locomotive-boiler Iprovidein the interior of the j tends `from the lire-box tube-:plate to the j smoke-box tubeplate of the boiler and which `may be either plain or corrugated. Inside of My `invention relates more particularly to.

boiler; and the objects of the invention are to 3 the` furnace-gases beingcaused to traverse the Referring to the laccompanying drawings,

i tive-boiler, showing the method of application j' of my invention. Figs. 2 and 3 arehse'ctions` l taken on the `lines A Band C D, respectively,

p y when it is required to break the joint. Figs. 4 and 5 are an elevation and dinalsectionand Fig."9`an end View hal-f inl boiler-Shen a longitudinal nu@ a, which 9X-- this flue I arrange a nest ol tubes l), which are preferably fitted ataninclination to the axis of the boiler, the slope being upward toward the iirebox end. At the lower or smoke-box `endof the tubes a connecting box or header c is litted, having a cover cl and communicating with the water-space of the boiler through the connection e. For the purposes of illustration this connection is shown at the bottom of the boiler. l It will, however, be preferable, to avoid any sediment which may collect,to place it more-at the side of the boiler. The tubes are carried across the upper portion of the lire-.box to the front ofthe boiler,where they terminate in another header f, tted with a cover h', but modified, as shown in Figs. 6 and 7, to admit "of its being secured to the ring z', which is securely riveted in place between the boilershell and the lire-box. The headerf may communicate with either the steam or water space of the boiler. j As shown in Fig. 3, the ring@` is roughly pear-shaped and incloses both the headerfand the tire-hole 7c. Itis provided at the top with a slotfm, which, togetherwith a slot n in the header f, allows the steam generated to escape. The slot fm also allows the two bolts o o to pass through and bescrewed to the bridge@ by the blank end nuts Q q, thus insuring a tight joint between the two faced surfaces r and s, Figs. 4. and 6.

Isometimes prefer to use a soft-copper ring for making this AMy object in using the blank end nuts I provide two hand-holes tt in the shell of the boiler, which in the ordinary course of working are closed by blanklanges.A These hand-holes allow a box-Spanner to beinserted i whenever it is necessary to work the nuts q q. It will be seen that by this arrangement the posed to the heat of the furnace beneath them.

"front ends of the water-tubes are directly exi i. The usual smoke-tubes u rtare arranged in` .tubes immediately above the`crown of the Hue. By this arrangement owing tothe large heating-surface which becomes available land to the continuous circulation of the body of water in streams an increased evaporative ei"-v ciency is possible. Brick baffles z ,z are provided with the usual object.

To still further enlalge the heating-surface of the boilerI sometimes place additional water-tubes L1/u immediately above the iire, as shown in Figs. 1, 2, and 3. To insure an efticient circulation through this part of the steam -generating system where the conditions are somewhat more trying,I may'provide tubes w and m, tu connected to the water-space and a; to either the water or steam space, circulation taking place in the direction shown by the arrows..

In Figs. S and 9 I have shown the application of my invention to an ordinary singleended marine boiler. I employ two nests of water-tubes 2 and 3, the one set situated in the upper part of the furnace 4, the other set in a special iiue 5, riveted to the two tubeplates. This flue, which may be either plain or corrugated, I sometimes slope at the same angle as the tubes, or else I adopt/the method of Fig. 1, keeping the iue horizontal and sloping the tubes only. Ordinary smoke-tubes 6 6 are arranged Vwhere space allows around the Iine 5. The tubes 2 and 3 are secured at either end to headers 7 and 8, the, headers at the back being in their turn secured to rings 9 in the manner already described, and illustrated in Fig. 3. Y It is, however, to be noted that in the lower back-header the arrangement of Fig. 3 is preferably reversed, so that the slots m and n, bolts o, bridge-piece p, &c., `are now at the bottom instead of at the top ofthe header. Suitable connectionsl 10 and 11 are made between the front headers and the water or steam spaces of the boiler and baffles 12 12 are placed in' the iiue.

Instead of the lconnection 11 outside the boiler I sometimes shorten the tubes 3, so as to .bring the header 7 inside the furnace, a very short connection being then sufcient between the header and the furnace-crown.

ings) for cleaning the tubes, flue, &c.

In the dry-back type of boiler the tubes would cross the combustion-chamber, the header standing in the brickwork I'lue being 1 I may also use an air-blast (not shown in the drawend, a plurality of fire-tubes extending horizontally from said chamber, a lire-1i ue located .in proximity to said tubes,.a plurality of water-tubes extending through the iire-iiue and combustion-space, headers connected to said water-tubes at each end, a plurality of watertubes extending above the grate, headers connecting the ends of said last-named tubes and connections from said headers to the steam or water spaces of the generator, substantially as described.

2. In combination with the {ire-ilue and combustion-space of a tire-tube generator, of aI ,ring cutting onf part of the water-space, a

group of Vwatertubes passing through said iiue, a header at each end to which said tubes are-connected, and a bridge-piece and bolts with blank end nuts for clampingone of said headers to the rin g,substantially asdescribed.

3. The combination with the iire-iiue and combustion-space of a tire-tube generator, of a ring cutting 0E part of the water-space, a group of water-tubes passing through said Iiue, a header at each end to which said tubes are con nected,remo'vablecovers for said headers, and a bridge-piece and bolts with blank end nuts for clampingone of said headers to the ring, substantially as described.

4. In a steam-generator of the cylindrical marine type, the combination with the reflue and combustion-space, of a group of water-tubes passing through said tine and the upper part o f the combustion-space, a second group of water-tubes in proximity to the fireb'ed, headers at each end for each group of tubes, and connections from said headers to the steam and waterspace o f the generator, substantially as described.

In witness whereof I have hereunto set'my I hand in presence of two witnesses. y

HARRY PLGWMAN.

Witnesses: Y

ALBERT E. PARKER, FRANCIS J. BIGNRLL.

IOO 

